Πώς να σχεδιάσετε πλακέτες τυπωμένων κυκλωμάτων ... και να παραμείνετε ΗΡΕΜΟΙ!!!.

PCB Μία μηχανολογική λύση σε ένα ηλεκτρονικό πρόβλημα 2 Photo from hephaestusaudio.com Photo from www.sparkfun.com 2

Image from www.elkosoft.com PCB? Layers, Traces, Planes, and Vias ... Image from www.elkosoft.com 3

Image from www.gettyimages.com PCB Αρχικά η δουλειά σας θα είναι ... Image from www.gettyimages.com 4

The PCB Design Process Schematic Capture Place Components Route Traces Επανάληψη Route Traces Eagle PCB www.cadsoft.de Generate Gerbers Fab! 5

Eagle PCB Control Panel Library A CAD Tool For Designing a Board Project Schematic Capture Layout Symbol Footprint Library 6

Eagle PCB Symbol Device Footprint Symbol + Footprint + Device = Component Symbol Sym Device Dev Footprint Pac 7

Eagle PCB ΈΝΑ πλάνο! Block Diagram Επιλογή εξαρτημάτων Τι χρειάζομαι για να ξεκινήσω ΈΝΑ πλάνο! Block Diagram Επιλογή εξαρτημάτων Απαιτήσεις συνδεσεων και σημείων δοκιμών Απαιτήσεις τροφοδοσίας Πρόσβαση σε βιβλιοθήκες 8

Eagle PCB Εξαρτήματα Συνδέσεις Τροφοδοσία / επιδόσεις Passives: 0805, 0603, etc. Mechanical Connections Power Ratings IC Packages: QFN, TQFP, etc. Bus Connections Battery Performance High-Speed / High-Sensitivity Libraries PC Connections 9

Eagle PCB Launch Eagle File -> New -> Project Enter Project Name Creating a New Project Launch Eagle File -> New -> Project Enter Project Name Directory structure taken care of automagically. Active project is shown with a green light. 10

Eagle PCB Πλήρης έλεγχος διαμέσου control panel Πρόσβαση σε ββλιοθηκες Πλήρης έλεγχος διαμέσου control panel Μπορείτε να κατεβάσετε οποιαδήποτε βιβλιοθήκη και να την τοποθετήσετε στο φάκελο /lbr Η Sparkfun έχει μια τεράστια συλλογή ΠΡΟΣΟΣΧΗ! ΤΟ γεγονός ότι βλέπετε μία βιβλιοθήκη στο Control Panel δεν σημαίνει ότι είναι πλήρως αυτή είναι doesn’t mean you can access it in your schematic.

Schematic Capture File -> New -> Schematic Save it right away. Creating a New Schematic File -> New -> Schematic Save it right away. Don’t worry about creating a Board just yet. Keep the 100-mil grid.

Schematic Capture Click the Add icon Find the component in the library Adding Components Click the Add icon Find the component in the library Set values Don’t see the library? Try Use -> Library 13

Schematic Capture Click the Add icon Adding Global Symbols Click the Add icon Find the global symbol in the library (supply1) Place as if it were a component 14

Schematic Capture Click the Wire icon Have at it! Adding Traces (aka Wires) Click the Wire icon Have at it! 15

Schematic Capture Some General Tips Avoid changing the grid unless absolutely necessary. Free Eagle version does not allow “sheets”. Free Eagle version requires that schematic drives the layout ... not vice-versa. Groups, Info, and Layers icons are useful. Pan, zoom, niceties easy to use. Really care about that “net”? Label it. Keep it clean - don’t be lazy. Document! 16

Place Components But before you do ... Schematic Capture Place Components But before you do ... Passives - 0805 means 0.08” by 0.05” Connectors - beware of physical fit Actives - lots of packaging alternatives Give thought to testability and troubleshooting Thru-Hole (TH) Surface Mount (SMT) DIP LQFP, QFP, TQFP QFN BGA 17

Place Components Creating a new board design Schematic Capture Place Components Creating a new board design From the schematic, choose File -> Switch to Board. “Create From Schematic”? You bet! Board window automatically opens. 18

Place Components Some Common Tasks Schematic Capture Place Components Some Common Tasks Right-click on top of component, select Move to reposition. While moving, right- click to Rotate. Use “Group” wisely. Right-click to Mirror (change to other side of board) Use Move to change outline 19

Place Components Thinking ahead Take your time. Untangle flight lines. Schematic Capture Place Components Thinking ahead Take your time. Untangle flight lines. Think about planes. Consider testability. Mechanical Fit? Hard stuff first. Keep silkscreen. Think hard about components on 2-sides. 20

Place Components Some General Tips Schematic Capture Place Components Some General Tips Are your Design Rules setup correctly? Run the Design Rule Check (DRC) often. Run the Electrical Rule Check (ERC) often. Save a snapshot of your placement file. 21

Route Traces Adding “Waaaahrs” To Your Layout Schematic Capture Place Components Route Traces Adding “Waaaahrs” To Your Layout You want to route, not wire. You want to ripup, not delete nets. Are you on the top or the bottom? Vias are on top and bottom. Easy to add. DRC often! Iterate like mad. 22

Route Traces Some General Tips Schematic Capture Place Components Route Traces Some General Tips Two layers? Have an x- layer and a y-layer. Don’t forget mounting holes, other nice things. Add testability features. Do the “what if?” dance. Do the cardboard mockup. Pour Copper. 23

Generating Gerbers Some General Tips Schematic Capture Place Components Route Traces Some General Tips Gen Gerbers Easier than spit! Using Advanced Circuits? Have I got a script for you ... This involves the “CAM Processor” ... Generate critical layers. 24

Generating Gerbers Sanity Checking The Result Schematic Capture Place Components Route Traces Sanity Checking The Result Gen Gerbers freedfm.com You’ll need an account with Advanced Circuits. Email will be sent confirming design rule checking. Advanced Circuits even gives you a discount. Squash any errors, review all warnings. Look for open vias, closed vias, etc. 25

Generating Gerbers Reviewing The Result Schematic Capture Place Components Route Traces Reviewing The Result Gen Gerbers ViewMate - Free Gerber Viewer for Microsoft Windows (link on Dr. Wickert’s site). Review planes, drill holes, and “obvious” defects. Not usually any surprises here. Biggest error - not exporting the proper layers. 26

Fab Before you hit “the button” ... Schematic Capture Place Components Route Traces Before you hit “the button” ... Gen Gerbers Fab! Generate a Parts List (aka “The BOM”) using Export -> Partlist. Generate a Pin List (aka “The Netlist”) using Export -> Netlist. Sanity check both. 27

Fab Some General Tips Do you have all of your components? Lead time? Schematic Capture Place Components Route Traces Some General Tips Gen Gerbers Fab! Do you have all of your components? Lead time? Find out what file format your PCB Vendor wants. Advanced Circuits - GERBER_RS_274X (no, really) Consider routing it yourself at UCCS. Consider barebonespcb.com. Really cheap. Sleep on it. Follow my tradition - 28

The PCB Design Process A Summary of a Lot of Information Schematic Capture Place Components Iteration Route Traces Eagle PCB www.cadsoft.de Generate Gerbers Fab! 29

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